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VLA SPECTRAL LINE OBSERVATIONS OF A SHOCKED COLD H II REGION IN G70.7+1.2

机译:G70.7 + 1.2中受冲击的H II类区域的VLA谱线观测

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We have observed the molecular globule G70.7+1.2 at 1375 MHz using the C configuration of the VLA, and have imaged a peculiar H168α recombination line detected at the Arecibo radio telescope. The narrow width of the recombination line (Δv ~ 3 km s~(-1)) indicates gas cooler than 185 K and suggests that the globule harbors the coldest known H II region. Previous work showed that the recombination line came either from newly ionized gas outside a bow shock produced by supersonic motion of an early-type star through the molecular globule, or from a cold H II region inside the globule. The 20″ angular resolution of the VLA image of G70.7-1.2 was sufficient to resolve the separation between the nonthermal radio-emitting bow shock and the thermal H II region. The spectral line images show that the radio recombination line comes from cold gas near the outer boundary of the bow shock and that the line intensity is enhanced by stimulated amplification of the nonthermal continuum emanating from the bow shock.
机译:我们已经使用VLA的C构型在1375 MHz处观察到了分子小球G70.7 + 1.2,并且对在Arecibo射电望远镜中检测到的独特的H168α重组线进行了成像。重组线的较窄宽度(Δv〜3 km s〜(-1))表明气体温度低于185 K,这表明该球状体含有已知最冷的H II区。先前的工作表明,重组线要么来自由早期型恒星通过分子小球的超音速运动产生的弓形激波外的新电离气体,要么来自小球内部的冷H II区。 G70.7-1.2的VLA图像的20英寸角分辨率足以解决非热辐射发射弓形激波和热H II区域之间的分离。频谱线图像显示,无线电复合线来自弓形激波外边界附近的冷气体,并且线强度通过弓形激波产生的非热连续体的受激放大得到增强。

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